US US-23 F 3 Flex x Rout ute Co Cost-Bene nefit Stephanie - - PowerPoint PPT Presentation

US US-23 F 3 Flex x Rout ute Co Cost-Bene nefit

Stephanie Palmer, P.E. University Region Traffic Safety & Operations Engineer Michigan Department of Transportation

US US-23 F 23 Flex x Rout

• ute
• Located North of Ann

Arbor

• Recurring Directional

Peak Hour Congestion

• Non-Recurring

Congestion

• Incidents
• Special events
• Interchange and

Mainline Operational Issues

Flex R x Rout

• ute

A TM C Com

• mpone

ponent nts

• Dynamic

Shoulder Use

• Dynamic Lane

Control

• Variable Speed

Advisories

• Queue Warning

Dyna ynamic S Shoul houlde der

Dynam amic ic L Lan ane U e Use

Var aria iable S Speed eeds

Que ueue ue W Warni ning ng

Perfor

• rmance M

Moni

• nitor
• ring

ng

• MDOT tracking monthly performance measures (started Jan 2018)

– Travel times, speeds, planning time index, and crash data – Operation and Maintenance costs – Feedback from agency partners, the public, and emergency responders

• Early Results

– Improvements in travel time and reliability- especially for southbound US-23

• SB US-23 Planning time improvement over 50%
• SB US-23 travel time savings of about 5 minutes
• SB US-23 speed increases of around 20 mph
• NB US-23 improvements are minimal

US US-23 F 23 Flex x Rout

• ute

Co Costs

• Construction of ITS system- $16,000,000

– 30 full gantries, 3 cantilevers over shoulder – Communication and power

• Operation of the ITS system- $250,000/year
• Maintenance of the ITS system- still determining

but estimating at about $300,000/year

Bene nefi fit Cos

• st A

Ana nalys ysis-TO TOPS Input nputs

Benefits

• change in capacity- 28%
• change in speed- 10%
• reduction in crash rate- 20%
• reduction in crash duration- 30%
• reduction in fuel use- 9%
• time device is disseminating

useful information – 80%

• drivers using information – 80%
• time saved by drivers- 2 mins
• all other inputs left at default

Costs

• capital replacement costs

(and expected life)

• O&M Costs (annual)
• communication costs

*FHWA Tool for Benefit/Cost – TOPS-BC-Version 1.1 for Hard Shoulder Running

Bene nefi fit Cos

• st A

Ana nalys ysis Res esult lts

TOPS BC TIGER BC Average Annual Cost $2,300,517 (NPV Cost=$20,000,000*) N/A (Construction Cost $20 million, O/M Cost of $200k) Average Annual Benefit $11,645,248.50** Approximately $4 to 6.5 million 7% NPV total Benefit with TIGER Grant calculations $47,439,209 $17,133,402 *Originally underestimated construction cost in TOPS **TOPS model estimated more benefits than TIGER grant methodology

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